I took apart me old RE2 radio to see what the internal storage looked like. And its a IC on a board that uses a flex cable, so you would need to know the pin outs. I was expecting to see modified standard SD card in some type of holder, that made it a little more obvious.Awesome, thanks!
So there is hope for a manual fix if you want to get your hands dirty
Also found this one:
NaviTotal.com ? View topic - RB5 Uconnect touch 8.4N Map update needed